I bought it because there were abundant variations of diameters and there was a size that suits my needs.
Because it had elasticity, even when purchasing a slightly smaller size, it fitted perfectly, I understood that I managed to substitute to the extent that somehow water will not leak.

Actually it was not a translation with O-ring attached, but I measured the groove and I thought that this leak will be lost in this size. There was no water leakage and it was understood that it can be used not only as a genuine ring but it was purchased additionally.